Lake Carroll Sedimentation Disposal Dam 5 is an earth dam located in Carroll County, Illinois, built in 1992. It carries a Low hazard potential classification.
Dam profile
NID height · 21 ft21 ft tall and 2,100 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Lake Carroll Sedimentation Disposal Dam 5
The primary purpose of Lake Carroll Sedimentation Disposal Dam 5 is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Lake Carroll Property Owners Association (private). It impounds the Trib Lake Carroll near Mt. Carroll.
The dam stands 21 feet tall and stretches 2,100 feet across, and has a maximum storage capacity of 180 acre-feet. Completed in 1992, the structure is 34 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 10/22/2025.
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Location
| State | Illinois |
| County | Carroll |
| Nearest City | Mt. Carroll |
| River/Stream | Trib Lake Carroll |
| Coordinates | 42.19441, -89.84364 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 2,100 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 180 acre-ft |
| Max Storage | 180 acre-ft |
| Normal Storage | 150 acre-ft |
| Max Discharge | 44 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Debris Control |
| Owner | Lake Carroll Property Owners Association |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/22/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50132 |
| Federal ID | IL50132 |
| More Info | State Dam Safety Program |